Device for drawing rovings in speeders and spinning machines



Aug. 1940- H. o. HESS 2,211,117

DEVICE FOR DRAWING ROVINGS IN SPEEDERS AND SPINNING MACHINES Filed Sept. 2, 1938 Patented Aug. 13, 1940 DEVICE FOR DRAWING ROVINGS IN SPEED- ERAS AND SPINNING MACHINES Heinrich Otto Hess, Winterthur, Switzerland, as-

signor to Actiengesellschaft .1011. Jacob Cie., Winterthur, Switzerland Rieter &

Application September 2, 1938, Serial No. 228,244 In Germany September 6, 1937 1 Claim.

This invention relates to a device for drawing rovings in speeders and spinning machines.

When short-fibered material has to be spun and structural reasons forbid the reduction of the gripping space between the drawing rollers to staple length, or approximately so, revolving or twisting tubes are frequently used for drawing the roving. Such tubes give more or less false twist to the roving, which like other twists particularly acts on the weak portions of the roving and imparts to them special strength, so that they can be drawn to a limited extent over a greater length than that of the fiber. The thick portions of the roving to which less twist has been given offer less resistance to draft and are thus drawn out more, which results in equalization of the yarn.

It is the object of the invention to provide a revolving tube on which the roving fed to it is held and guided in a particularly advantageous manner consiituting an improvement over the known art.

One of the known revolving tubes which is widely used is provided in its delivery part in the direction of the drawing rollers with a wirelike continuation resembling a corkscrew which drives the roving by frictional contact. This simple construction is, however, open to the objection that the roving tends to drop 01f from the point of the continuation with the result that the distance at which left-hand and right-hand twists meet and compensate one another is continually changing relative to the space between the drawing rollers. Directly at the point of transition the roving has no twist at all, and if this point is much farther away from the working space between the rollers than the length of the main portion of the fibers, breakage or cuts will occur owing to lack of adhesion. Furthermore, driving of the roving due to frictional contact with the continuation is irregular. The tube must carry out a relatively large number of revolutions to produce the necessary twist, which involves also an increase in the power consumption of the machine.

In order to overcome these drawbacks it has further been proposed slightly to clamp the roving between two laminated springs arranged at the end of the tube. This construction, however, renders the introduction of broken threads difficult, and leaf springs, on account of the requisite width, cannot be brought up very close- 1y to the space between the drawing rollers.

For the same reasons holders provided with flaps attached to the revolving tube, which press the roving due to the action of centrifugal force, do not fully meet all requirements and possess, moreover, the drawback of flattening out the roving.

In other known revolving tubes having a bore eccentrically extending in the direction of the delivery and opening laterally of the points the roving also easily jumps off from the point between the drawing rollers, so that the twist compensating point is positioned at uneven distances from the working space of the rollers.

Similar conditions prevail if bowlike guides are employed at the end of the revolving tubes for holding a body having a milled groove between them. In such constructions the thread is, furthermore, not positively guided.

The invention overcomes these defects by providing on the revolving tube a guide formed of a plurality of pins preferably uniformly distributed over the circumference of the running-out end of the rotary body, the pins being inclined relative to the axis of the tube in such manner that the points thereof meet near the space between the drawing rollers and form a sort of basket or frame. These pins positively guide the roving between their points and keep it close to the space between the rollers whence the false twist is propagated to the rear of the roving. The point of transition, however, always remains at the same place and so near the space that even very short fibers will either be gripped by the drawing rollers or adhere to the roving owing to the false twist. Faulty drafts are thus avoided. The pins enter the roving uniformly from all sides and carry it securely along during rotation, so that the speed of the revolving tube may be decreased to save power. Furthermore, the pins have also a combing efiect upon the fibers which are therefore arranged more parallel in the finished yarn so that the latter has a smoother surface with fewer projecting fibers. The roving is, moreover, not squeezed flat by the pins, and floating fibers on passing fromv the pin points to the drawing rollers for this reason do not drop out of the drawing field. Being embraced in a basket-like manner, the roving fed to thedevice is safely conducted to the points without showing any tendency to move outward- 1y away from the opening of the rotary body under the action of centrifugal force and to laterally emerge in front of the drawing rollers.

The invention is illustrated by way of example in the accompanying drawing, in which Figure 1 is a sectional view of the device according to the invention showing in side view some of the parts of the associated drawing frame, and Fig. 2 is an end view of the revolving tube.

The roving l is introduced by the feed rollers 2 and 3 and passes over the conductor 4 into the spinning tube 5 on which a wharve 6 is disposed driven by means of a cord or band. The wharves 6 drives the front rotary body 1 in which the pins 8 are arranged. The pins 8 converge in funnel fashion, and their points project far between the drawing rollers 9 and H]. These points hold and twist the roving l near the gripping line of the rollers 9 and In by penetrating the roving. A plurality of tubes 5 is always disposed in a beam II which rests on the supports H3 in slide-like guides 12. By means of screws Hi" the distance of the points of the pins 8 from the drawing rollers 9 and ii] may be adjusted as required.

It is further possible according to the invention to provide instead of one group two or more groups of pins differently inclined relative to the axis of the tube so as to form two or more funnel-like baskets or frames extending one after and into another. The rovingi is then held and guided at two or more places difierently spaced from the gripping line of the roller ends, whereby the driving of the roving during rotation will be insured still more and the clamping effect of the pin points increased.

The invention is not restricted to the embodiment shown and described, but may be modified in many ways Without deviating from its fundamental principle.

I claim:

Apparatus for drawing the roving in speeders and spinning machines comprising in combination with drawing rollers, a rotatable tube, means arranged on the tube for holding and guiding the roving comprising a plurality of pins inclined with respect to the axis of the tube and converging so that the points thereof meet at a point adjacent the space between the drawing rollers in an extension of the axis of the tube for positively guiding the roving between the rollers and combing the roving.

HEINRICH OTTO HESS. 

